Abner g



(No Model.)

A. G. GILLETTE.

TALO PULVBRIZER.

No. 390,852. Patented 001;. 9, 1888.

8 ill mar ll Gillaiiailnrrsn STATES PATENT omen.

ABNER G. GILLETTE, OF ATLANTA, GEORGIA.

TALC=PULVERIZER.

SPECIFICATION forming part of Letters Patent No. 390,852, dated @ctcser 9, 1888.

Applicaii: n filed February 17, 1888.

1'0 all whom, it may concern.-

Beit known that l, ABNER G. GILLETTE, a citizen of the United States, residing at Atlanta, in the county of Fulton and State of Georgia, have invented a new and useful Talc- Pulverizer; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

This invention relates to machinery for pulverizing talc or steatite.

The invention obviates the difficulties experienced in attempting to grind or pulverize talc by the ordinary burr-stone or rollermill, or by a stamping-mill process. These difficulties are due to the composition of the tale or steatite being such as to cause the stamp and roller mills above mentioned to only partially disintegrate it, and at the same time to pack it into a compact mass; or, in the case of the burr-mill, the substance has a tendency to pack in the furrows in the faces of the stones. All of these difficulties are obviated by my device, the details of which will be hereinafter fully described, and the parts thought to be new pointed out in the claims.

In the accompanying drawings, Figure 1 is an elevation, partly in section, showing the heaters, with proper pulleys and shafting for running the heaters in opposite directions, the feed-chute, and the outlet-flue. Fig. 2 isa central crosssection of Fig. 1, showing the construction and form of the interior. Fig. 3 is an end elevation showing the air-inlet and, its regulating'gate and other details of construction.

In the figures like reference-marks indicate corresponding parts in the several views.

A is the cylinder, and Bthe beater-arms.

G is the inlet or feed-chute, and D is the outlet-flue.

The cylinder A is dentated on itsinner surface, except a small portion near the bottom of the cylinder, which is preferablyleftsmooth for ease in starting the machine, as, after stopping the machine, all material left therein will fall to the bottom, there impeding the Serial No. 201,442. (No model.)

ready starting of the machine should the increased friction produced by contact of this material with dentations on the bottom be present; also, the dentations, ifat the bottom, would fill up with material during the operation of the machine; and after further description of the device it willbe readily seen that dentation would be almost wholly inopera tive by reason of their position at the bottom and the fact that the material would not rebound therefrom to a sufficient extent to render dentations so placed fully operative on account of this filling up with material. This cylinder A is provided with heads or end pieces, a, in both of which are holes for the insertion of the shafts, and one has an opening and chute, G, for the introduction of the raw material, and the other an opening for the passage of air, which opening is enlarged or reduced by a damper, a. (Best shown in Fig. 3.) In the interior, as shown in Figs. 1 and 2, are beater-arms B, which may be of any number. These beater-arms B have on their extremities the plates of metal 72, set at an angle to the shaft, as shown. If found necessary for pulverizing material, these plates B may be set at any desired angle toa radial line. It-

is, however, preferable that the said plates be sloped slightly forward. The shafts of these heaters revolve in opposite directions and at a high rate of speed, as hereinafter set forth.

The operation of the device is as follows: The machine being started, the beater-s revolving in opposite directions, the material is fed in sufficient quantity through the chute G, and the damper of the air-inlet is opened sufficiently to allow the air to enter in quantities requisite to blow the material which by the process becomes pulverous out of the flue D, which flue is long enough to prevent the celr trifugal force from throwing out material which is not sufficiently fine for use. This flue generally extends to an upper or adjacent room, in which room the powdered tale is re ceived. As the centrifugal force keeps the material against the inner dentated surface, and the angle of the plates 12 on the beaterarms B is such as to keep the bulk of the material in the center of the said dentated surface, and as the two sets of beater-arms revolve in an opposite direction, twoiannnlar masses of material are kept in forcible contact, each mass being agitated and abraded by the inner surface of the cylinder, and the said two masses will grind against each other, producing frictionsuflicienttopulverizetheentire mass in a short time. As the revolution of the heaters is rapid, and as the plates 7) are of sufficient size, a blast will keep the mass entirely free from pulverized material, the same being blown out of the flue D as fast as pulverized. On account of the angle of the plates the material will be thrown somewhat from side to side.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is

1. In a talc-pulverizer, the combination of the heaters adapted to revolve in opposite di rections, with their inclosing-eylinder and its lining, said lining being formed ol'smooth scctions located at the bottom of the cylinder,and dcntated sections, forming the upper lining of the cylinder, substantially as set forth.

2. In a talc-pulverizer, the combination of the cylindrical vessel A, having dentated panels, forming the top ofthe eylinder,and smooth sections, forming the bottom, the heaters B, adapted to revolve in opposite directions, and having plates 1) set at an acute angle to the axis of said heaters, the feed-chute O, the airinlet and its regulating-gate a, and the outletline D, all combined and operating substantially as shown and described, and for the purpose set forth.

In testimony whereofl'. aflix my signature in presence of two witnesses.

ABNER G. GILLETTE. l'Vitnesses:

A. P. W001), ALBERT A. Woom 

